The dogma of faith which forms the object of the feast is this: There is one God and in this one God there are three Divine Persons; the Father is God, the Son is God, the Holy Spirit is God. Yet there are not three Gods, but one, eternal, incomprehensible God!
The Father is not more God than the Son, neither is the Son more God than the Holy Spirit. The Father is the first Divine Person; the Son is the second Divine Person, begotten from the nature of the Father from eternity; the Holy Spirit is the third Divine Person, proceeding from the Father and the Son. No mortal can fully fathom this sublime truth. But I submit humbly and say: Lord, I believe, help my weak faith.
It may be interpreted as a finale to all the preceding feasts. All three Persons contributed to and shared in the work of redemption. The Father sent His Son to earth, for "God so loved the world as to give His only-begotten Son."
The Father called us to the faith.
The Son, our Savior Jesus Christ, became man and died for us. He redeemed us and made us children of God. He ever remains the liturgist par excellence to whom we are united in all sacred functions.
After Christ's ascension the Holy Spirit, however, became our Teacher, our Leader, our Guide, our Consoler. On solemn occasions a thanksgiving Te Deum rises spontaneously from Christian hearts.